Perrona loetschi, Harzhauser & Landau & Janssen, 2022

Harzhauser, Mathias, Landau, Bernard & Janssen, Ronald, 2022, The Clavatulidae (Gastropoda, Conoidea) of the Miocene Paratethys Sea with considerations on fossil and extant Clavatulidae genera, Zootaxa 5123 (1), pp. 1-172 : 109

publication ID

https://doi.org/ 10.11646/zootaxa.5123.1.1

publication LSID

lsid:zoobank.org:pub:036F6B4D-CDCC-4CD7-A914-9A1D8C7A097A

DOI

https://doi.org/10.5281/zenodo.6399833

persistent identifier

https://treatment.plazi.org/id/039487D1-FFEE-FFC5-FFBA-FF3C6AF4FF14

treatment provided by

Plazi

scientific name

Perrona loetschi
status

sp. nov.

Perrona loetschi View in CoL nov. sp.

Figs 32A View FIGURE 32 1 –A View FIGURE 1 3 View FIGURE 3 , B 1 –B View FIGURE 1 2 View FIGURE 2 , C 1 –C View FIGURE 1 3 View FIGURE 3 , D 1 –D View FIGURE 1 2 View FIGURE 2 , 5 View FIGURE 5 , 7 View FIGURE 7

Pleurotoma Jouanneti View in CoL [sic] Des Moul.— Hörnes 1854: 346 (partim), pl. 38, figs 4a–b [non Tomellana jouannetii ( Des Moulins, 1842) View in CoL ].

Pleurotoma (Clavatula) descendens Hilb. — Hoernes & Auinger 1891 (partim): 355, pl. 48, figs 7–8 [non Perrona descendens ( Hilber, 1879) View in CoL ].

Type material. Holotype: NHMW 1949 View Materials /0005/0102a, SL: 30.1 mm, MD: 13.5 mm, Grund ( Austria), illustrated in Hoernes & Auinger (1891, pl. 48, fig. 8), Figs 32A View FIGURE 32 1 –A View FIGURE 1 3 View FIGURE 3 . Paratypes: NHMW 1949 View Materials /0005/0102b, SL: 28.4 mm , MD: 12.1 mm, Grund ( Austria) , illustrated in Hoernes & Auinger (1891, pl. 48, figs 7a–b), figs 32B 1 –B 2; NHMW 1855 View Materials /0045/0752, SL: 28.0 mm , MD: 12.1 mm, Grund ( Austria) , illustrated in Hörnes (1854, pl. 38, figs 4a–b), figs 32D 1 –D 2; NHMW 2021 View Materials /0153/0001, SL: 31.3 mm , MD: 13.6 mm, Grund ( Austria) , figs 32C 1 – C 3; NHMW 2021 View Materials /0153/0002, 31 spec., Grund ( Austria) ; NHMW 1855 View Materials /0045/0752, 15 spec., Grund ( Austria) ; NHMW1860 View Materials /0050/0059, 2 spec., Neuruppersdorf ( Austria) , SMF 351872 About SMF /5, Grund ( Austria) .

Type locality. Grund ( Austria); North Alpine-Carpathian Foreland Basin .

Type stratum. Silty sand of the Grund Formation.

Age. Middle Miocene, early Badenian (early Langhian).

Etymology. In honor of Bernd Lötsch, Director General of the Natural History Museum in Vienna from 1994 to 2009.

Diagnosis. Perrona species of medium size, very solid, broad fusiform, with gradate spire, subcylindrical whorls with strongly swollen, weakly tuberculose subsutural collar. Absence of well-defined suprasutural cord. Much reduced spiral sculpture and relatively short siphonal canal.

Description. Shell medium-sized, very solid, broad fusiform with markedly gradate spire; apical angle 38–45°. Protoconch not preserved. Teleoconch of nine whorls. Early teleoconch whorls weakly concave with two narrow, adsutural spiral cords separated by weakly concave central part with close-set opisthocline, comma-shaped axial riblets. Axial riblets fading out on fourth whorl. Later whorls subcylindrical with prominent, sharply-delimited, swollen, rounded subsutural collar bearing poorly defined tubercles, weakly convex below, suprasutural cord very weak, almost entirely covered by succeeding whorl. Delicate spiral cords on spire whorls (rarely preserved in available material). Suture narrowly incised, linear. Last whorl ~65% of total height, subcylindrical. Subsutural collar very broad and swollen, rounded, weakly beaded. Subsutural ramp very narrow, weakly concave. Shoulder rounded, weakly convex below, weakly angled at moderately constricted and concave base. Siphonal fasciole moderately swollen with prominent growth increments. Sculpture extremely weak, fine indistinct cords over base and fasciole. Aperture moderately wide, pyriform. Outer lip not thickened, smooth within; anal sinus moderately deep, moderately narrow, asymmetrically U-shaped, with apex mid-ramp. Siphonal canal moderately long, moderately wide, only slightly deflected to the left with shallowly notched tip. Columella excavated in upper third, straight below, weakly twisted at fasciole, smooth. Columellar and parietal callus thick, sharply delimited, forming broad rim and narrow pseudumbilical chink.

Discussion. This species was confused by Hörnes (1854) with Tomellana jouannetii ( Des Moulins, 1842) , from the Burdigalian of Mérignac in France, and by Hoernes & Auinger (1891) with Perrona descendens ( Hilber, 1879) from the Badenian of the Paratethys Sea. The separation from Tomellana jouannetii is obvious based on the gradate spire, the irregularly beaded subsutural collar (see Peyrot 1931, pl. 8, figs 43, 61, 62, 66, 71) and the early teleoconch sculpture (see discussion on Tomellana ). The separation from Perrona descendens is less obvious at first sight. Nevertheless, Perrona loetschi differs in its more solid, broader shell, shorter spire, the broader ‘shelf’ of the subsutural collar, the lower penultimate whorl and higher last whorl, and the much reduced spiral sculpture. The broad outline and the absence of distinct spiral cords on the entire teleoconch allow also a separation from Perrona vindobonensis (Quenstedt, 1884) and P. ilonae nov. nom. Perrona louisae ( Hoernes & Auinger, 1891) has even broader whorls and differs in its pointed beads.

Paleoenvironment. At the locality Grund fossiliferous channel fills, which formed in middle to outer neritic environments bear allochthonous assemblages uniting coastal-mudflat faunas with inner neritic ones ( Zuschin et al. 2005; Roetzel 2009). Preservation and color of the shells, suggest, that Perrona loetschi belonged to the allochthonous shallow water fauna and not to the autochthonous deep-water fauna.

Distribution in Central Paratethys. Karpatian (early Miocene): North Alpine-Carpathian Foreland Basin: Neuruppersdorf ( Austria) (hoc opus); Badenian (middle Miocene): North Alpine-Carpathian Foreland Basin: Grund ( Austria) ( Hoernes & Auinger 1891).

MD

Museum Donaueschingen

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

Family

Clavatulidae

Genus

Perrona

Loc

Perrona loetschi

Harzhauser, Mathias, Landau, Bernard & Janssen, Ronald 2022
2022
Loc

Pleurotoma

Hornes, M. 1854: 346
1854
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF